Do i need antivirus on Sony tablet

do i need antivirus on Sony tablet also can I use as phone
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The installation of some sort of virus protection or Internet security software is highly recommended if you plan to use the tablet to browse the Internet. There is no antivirus app pre-installed on the tablet, but there are several antivirus applications available from the Google Play Store.
As for the question about using the tablet as a phone, the Xperia tablets sold in the US do not have 3G service capability. The only way to make phone calls would be with a VOIP application like Skype, which is pre-installed on the Xperia tablets.
If my post answers your question, please mark it as an “Accepted Solution”.

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How do i use firefox as a web browser on my sony tablet s when i try it makes me choose google

i bought a Sony tablet S for my wife. She wants to access a program for work from home. I downloaded Mozilla firefox to the Sony, but when I open it, and go to type in a web address, it makes me choose Google as a search engine. How can I use Firefox on the Sony tablet? I did not see it in the list of supported devices. Please help. My wife is very frustrated, because she can only open her work program using Mozilla Firefox.

Hi Paulmozzi!
Here it is the supported devices list: http://www.mozilla.org/en-US/mobile/platforms/
However, because of the large number of Android devices (phones and tablets), not all new devices could be tested yet, but the list will continue to be updated.
I am not sure if I understand correctly your issue. When typing something in url bar, you will have at least 4 default search engines (Google, Wikipedia, Amazon, Twitter), so you can choose any of them. If you want to install more search engines, here it is a useful link for that: http://mycroft.mozdev.org/search-engines.html (open this link using Firefox Mobile on your tablet).
If you still need more help, please let us know. Any more details regarding your issue will be very useful.

Hello! I bought sony tablet. when I turns it on it shows sign "sony" and that's it than black sreen.

Hello! I bought sony tablet. when I turns it on it shows sign "sony" and that's it than black sreen. can anyone help me with it?

Hi nutochka,
Try these troubleshooting steps.
IMPORTANT:Before starting this procedure, make sure the AC adapter is connected to the tablet charge connector and is plugged into a working wall outlet.
NOTE: Because each of these steps represents a possible solution to this issue, check the tablet status after completing each step.
Press and hold the power button for at least thirty seconds.
NOTE: If the tablet turns off, press the power button again to turn the tablet back on. If the tablet turns on, you should be able to use it normally. If it does not turn on, proceed to the next step.
If tablet is still frozen or not responding, you will need to follow these steps to initiate a forced External Data Reset procedure.
IMPORTANT: Unfortunately, because it is being reset to the condition it was in when it was first purchased, all of the data and settings will be erased from the tablet.
With the tablet completely off, press and hold the Volume Up (+) button, and while continuing to hold that button, press and hold the Power button for several seconds.
Once the Sony logo appears, let go of the Power button.
Continue to hold the Volume Up (+) button until the Android system recovery screen is displayed. Once that screen is displayed, release the Volume Up (+) button.
IMPORTANT: Sometimes starting to the Android system recovery screen is enough to return the tablet to normal condition, and a forced External Data Reset procedure may not be needed. For this reason we recommend that you quickly press the Power button in order to cancel the reset and restart the tablet. If the tablet turns on and you are able to use it normally, no further action is necessary. If the tablet still does not operate normally, repeat steps 1-3 above and then proceed with the next step.
In the Android system recovery screen, use the Volume Down (-) button to highlight the Reset to factory settings option.
Quickly press the Power button.
In the Reset to factory settings: Confirm reset screen, use the Volume Down (-) button to highlight the Yes -- delete all user data option.
Quickly press the Power button.
The troubleshooting steps listed above should resolve your issue. If you have completed all of the steps and the issue is not resolved, service may be required.
If my post answers your question, please mark it as an “Accepted Solution”.

Hi, can someone help me, I did my first page in Muse, and I did just for computer, I need to do for tablet and phone, I have to do? thx

Hi, can someone help me, I did my first page in Muse, and I did just for computer, I need to do for tablet and phone, I have to do? thx
Esto puede ser en español? por favor

Hello,
Please refer to the links below, you will find them very useful.
Adobe Muse Help | Creating a website for Mobile devices
How to create a mobile website with Adobe Muse | Adobe Muse CC tutorials
Video Tutorials:
Design for mobile first | Adobe Muse CC tutorials
Mobile best practices | Adobe Muse CC tutorials
Plan your mobile site | Adobe Muse CC tutorials
Preview your mobile site | Adobe Muse CC tutorials
How to create a mobile website with Adobe Muse | Adobe Muse CC tutorials
Regards
Vivek

I used the article "How to connect Sony Tablet with adb protocol through USB?" Article ID:474705. E

I used the article "How to connect Sony Tablet with adb protocol through USB?" Article ID:474705.
Everytime I restart the computer now I get a open with window.
When I select Notepad and open it I get
0x54c Noswal\.android\adb_usb.******
How do i undo that.
If it helps the Article ID:474705 this says at one point
3. Open a shell prompt and enter the following command: echo "0x54c" >> $HOME/.android/adb_usb.******.
I gues that's what's creating the problem.
Please help.

Hi elishacuthbert.
Try disabling the start-up items in your computer to troubleshoot the issue. Follow the steps mentioned below:
Right click on the Taskbar > Task Manager > Start-up > Select the applications > Disable.
Note: If my post answers your question, please mark it as an "Accepted Solution."

What version of ACR do I need for my Sony A37 for Elements 6 ?

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For the SLT-A37 you have two alternatives:
(1) Upgrade to PSE 11. (2) Download and install the free Adobe DNG converter to convert your raw files to the Adobe universal Raw format and the files will open in all versions of PSE (keep your originals as backups and for use in the camera manufactures software)
Windows download click here DNG Converter 7.3
Mac download click here DNG Converter 7.3
You can convert a whole folder of raw images in one click. See this quick video tutorial:
You Tube click here for DNG Converter tutorial

Can't connect Sony Tablet to wifi ?

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Wi-Fi, depending on which 802.11 specification is in question (-, a, b, g, n) works at either 2.4GHz, 3.7GHz (US only) or 5GHZ:
http://en.wikipedia.org/wiki/IEEE_802.11
http://en.wikipedia.org/wiki/Wi-Fi
The C7 is listed as supporting 802.11 b/g/n on http://www.developer.nokia.com/Devices/Device_specifications/C7-00/

Do I need antivirus for my new iMac?

I just bought a new iMa. This is my first Mac and I am not sure if I need antivirus or not??
If so, which one do you recommend?

ClamXav : http://www.clamxav.com/ and that's it, unless you plan to install Windows too. Look over to the right and search the threads under "more like this that ask the same questions. Also, read this: http://www.reedcorner.net/guides/macvirus/

Do i need antivirus for my nokia 5130 ? Where do i...

Hi
I want to know if i need antivirus for my phone because i want to share some file with my friends and there is a chance of getting infected with virus . Thanks

We have an article in your Pool of Knowledge, that´ll help you keeping your phone secure!
PoK - Keep your phone secure!
Hope this cleared things a bit up for you?
grschinon: Had you forgotten that we had worked this out already?
By clicking the "Kudos!" or the "Solution?" button on the right you can say "Thank You" and you´ll show the author and others that the post is useful.
The day we stop improving is the day we stop being good.

Do I need antivirus on my iPad?

Hi, Please could someone tell me if I need antivirus on my ipad2? Only had it a couple of days but just wanted to make sure before I did any banking etc.
Thanks in advance.
Trish

You should be aware that the iPad works on wireless. If you are entering your ID & password for a bank site, your wireless signal could be intercepted by someone, especially if you are in a public WiFi location.
 Cheers, Tom

Do i need antivirus on my mac?

do i need antivirus on a mac?

Had heard about that one, but forgot about it when I replied. Looks like the earlier version needed Rosetta or a PPC Mac!
http://reviews.cnet.com/8301-13727_7-57469668-263/new-web-exploit-targets-multip le-platforms/
https://www.f-secure.com/weblog/archives/00002397.html
Anyway, yet another reason to keep Java disabled.

Do I need antivirus on my Galaxy 3?

Do I need antivirus on my GalaxyS3 phone?

Well, in my opinion you should have it but some will say no. I think with the large number of smartphones being sold now and thier ability to surf the web, the hackers will deem it worth thier while to write viruses for android.
But it is a smaller segment compared to say the microsoft operating systems on your computers, but of course, in the end, it's your choice.
Edit: So I agree with Ann.

I am using osx yosemite,Do i need antivirus in my pc?

i am using osx yosemite,Do i need antivirus in my pc?

Mac users often ask whether they should install "anti-virus" software. The answer usually given on ASC is "no." The answer is right, but it may give the wrong impression that there is no threat from what are loosely called "viruses." There is a threat, and you need to educate yourself about it.
1. This is a comment on what you should—and should not—do to protect yourself from malicious software ("malware") that circulates on the Internet and gets onto a computer as an unintended consequence of the user's actions. It does not apply to software, such as keystroke loggers, that may be installed deliberately by an intruder who has hands-on access to the computer, or who has been able to take control of it remotely. That threat is in a different category, and there's no easy way to defend against it.
The comment is long because the issue is complex. The key points are in sections 5, 6, and 10.
OS X now implements three layers of built-in protection specifically against malware, not counting runtime protections such as execute disable, sandboxing, system library randomization, and address space layout randomization that may also guard against other kinds of exploits.
2. All versions of OS X since 10.6.7 have been able to detect known Mac malware in downloaded files, and to block insecure web plugins. This feature is transparent to the user. Internally Apple calls it "XProtect."
The malware recognition database used by XProtect is automatically updated; however, you shouldn't rely on it, because the attackers are always at least a day ahead of the defenders.
The following caveats apply to XProtect:
☞ It can be bypassed by some third-party networking software, such as BitTorrent clients and Java applets.
☞ It only applies to software downloaded from the network. Software installed from a CD or other media is not checked.
As new versions of OS X are released, it's not clear whether Apple will indefinitely continue to maintain the XProtect database of older versions such as 10.6. The security of obsolete system versions may eventually be degraded. Security updates to the code of obsolete systems will stop being released at some point, and that may leave them open to other kinds of attack besides malware.
3. Starting with OS X 10.7.5, there has been a second layer of built-in malware protection, designated "Gatekeeper" by Apple. By default, applications and Installer packages downloaded from the network will only run if they're digitally signed by a developer with a certificate issued by Apple. Software certified in this way hasn't necessarily been tested by Apple, but you can be reasonably sure that it hasn't been modified by anyone other than the developer. His identity is known to Apple, so he could be held legally responsible if he distributed malware. That may not mean much if the developer lives in a country with a weak legal system (see below.)
Gatekeeper doesn't depend on a database of known malware. It has, however, the same limitations as XProtect, and in addition the following:
☞ It can easily be disabled or overridden by the user.
☞ A malware attacker could get control of a code-signing certificate under false pretenses, or could simply ignore the consequences of distributing codesigned malware.
☞ An App Store developer could find a way to bypass Apple's oversight, or the oversight could fail due to human error.
Apple has so far failed to revoke the codesigning certificates of some known abusers, thereby diluting the value of Gatekeeper and the Developer ID program. These failures don't involve App Store products, however.
For the reasons given, App Store products, and—to a lesser extent—other applications recognized by Gatekeeper as signed, are safer than others, but they can't be considered absolutely safe. "Sandboxed" applications may prompt for access to private data, such as your contacts, or for access to the network. Think before granting that access. Sandbox security is based on user input. Never click through any request for authorization without thinking.
4. Starting with OS X 10.8.3, a third layer of protection has been added: a "Malware Removal Tool" (MRT). MRT runs automatically in the background when you update the OS. It checks for, and removes, malware that may have evaded the other protections via a Java exploit (see below.) MRT also runs when you install or update the Apple-supplied Java runtime (but not the Oracle runtime.) Like XProtect, MRT is effective against known threats, but not against unknown ones. It notifies you if it finds malware, but otherwise there's no user interface to MRT.
5. The built-in security features of OS X reduce the risk of malware attack, but they are not, and never will be, complete protection. Malware is a problem of human behavior, not machine behavior, and no technological fix alone is going to solve it. Trusting software to protect you will only make you more vulnerable.
The best defense is always going to be your own intelligence. With the possible exception of Java exploits, all known malware circulating on the Internet that affects a fully-updated installation of OS X 10.6 or later takes the form of so-called "Trojan horses," which can only have an effect if the victim is duped into running them. The threat therefore amounts to a battle of wits between you and Internet criminals. If you're better informed than they think you are, you'll win. That means, in practice, that you always stay within a safe harbor of computing practices. How do you know when you're leaving the safe harbor? Below are some warning signs of danger.
Software from an untrustworthy source
☞ Software with a corporate brand, such as Adobe Flash Player, doesn't come directly from the developer’s website. Do not trust an alert from any website to update Flash, or your browser, or any other software. A genuine alert that Flash is outdated and blocked is shown on this support page. Follow the instructions on the support page in that case. Otherwise, assume that the alert is fake and someone is trying to scam you into installing malware. If you see such alerts on more than one website, ask for instructions.
☞ Software of any kind is distributed via BitTorrent, or Usenet, or on a website that also distributes pirated music or movies.
☞ Rogue websites such as Softonic, Soft32, and CNET Download distribute free applications that have been packaged in a superfluous "installer."
☞ The software is advertised by means of spam or intrusive web ads. Any ad, on any site, that includes a direct link to a download should be ignored.
Software that is plainly illegal or does something illegal
☞ High-priced commercial software such as Photoshop is "cracked" or "free."
☞ An application helps you to infringe copyright, for instance by circumventing the copy protection on commercial software, or saving streamed media for reuse without permission. All "YouTube downloaders" are in this category, though not all are necessarily malicious.
Conditional or unsolicited offers from strangers
☞ A telephone caller or a web page tells you that you have a “virus” and offers to help you remove it. (Some reputable websites did legitimately warn visitors who were infected with the "DNSChanger" malware. That exception to this rule no longer applies.)
☞ A web site offers free content such as video or music, but to use it you must install a “codec,” “plug-in,” "player," "downloader," "extractor," or “certificate” that comes from that same site, or an unknown one.
☞ You win a prize in a contest you never entered.
☞ Someone on a message board such as this one is eager to help you, but only if you download an application of his choosing.
☞ A "FREE WI-FI !!!" network advertises itself in a public place such as an airport, but is not provided by the management.
☞ Anything online that you would expect to pay for is "free."
Unexpected events
☞ A file is downloaded automatically when you visit a web page, with no other action on your part. Delete any such file without opening it.
☞ You open what you think is a document and get an alert that it's "an application downloaded from the Internet." Click Cancel and delete the file. Even if you don't get the alert, you should still delete any file that isn't what you expected it to be.
☞ An application does something you don't expect, such as asking for permission to access your contacts, your location, or the Internet for no obvious reason.
☞ Software is attached to email that you didn't request, even if it comes (or seems to come) from someone you trust.
I don't say that leaving the safe harbor just once will necessarily result in disaster, but making a habit of it will weaken your defenses against malware attack. Any of the above scenarios should, at the very least, make you uncomfortable.
6. Java on the Web (not to be confused with JavaScript, to which it's not related, despite the similarity of the names) is a weak point in the security of any system. Java is, among other things, a platform for running complex applications in a web page, on the client. That was always a bad idea, and Java's developers have proven themselves incapable of implementing it without also creating a portal for malware to enter. Past Java exploits are the closest thing there has ever been to a Windows-style virus affecting OS X. Merely loading a page with malicious Java content could be harmful.
Fortunately, client-side Java on the Web is obsolete and mostly extinct. Only a few outmoded sites still use it. Try to hasten the process of extinction by avoiding those sites, if you have a choice. Forget about playing games or other non-essential uses of Java.
Java is not included in OS X 10.7 and later. Discrete Java installers are distributed by Apple and by Oracle (the developer of Java.) Don't use either one unless you need it. Most people don't. If Java is installed, disable it—not JavaScript—in your browsers.
Regardless of version, experience has shown that Java on the Web can't be trusted. If you must use a Java applet for a task on a specific site, enable Java only for that site in Safari. Never enable Java for a public website that carries third-party advertising. Use it only on well-known, login-protected, secure websites without ads. In Safari 6 or later, you'll see a padlock icon in the address bar when visiting a secure site.
Stay within the safe harbor, and you’ll be as safe from malware as you can practically be. The rest of this comment concerns what you should not do to protect yourself.
7. Never install any commercial "anti-virus" (AV) or "Internet security" products for the Mac, as they are all worse than useless. If you need to be able to detect Windows malware in your files, use one of the free security apps in the Mac App Store—nothing else.
Why shouldn't you use commercial AV products?
☞ To recognize malware, the software depends on a database of known threats, which is always at least a day out of date. This technique is a proven failure, as a major AV software vendor has admitted. Most attacks are "zero-day"—that is, previously unknown. Recognition-based AV does not defend against such attacks, and the enterprise IT industry is coming to the realization that traditional AV software is worthless.
☞ Its design is predicated on the nonexistent threat that malware may be injected at any time, anywhere in the file system. Malware is downloaded from the network; it doesn't materialize from nowhere. In order to meet that nonexistent threat, commercial AV software modifies or duplicates low-level functions of the operating system, which is a waste of resources and a common cause of instability, bugs, and poor performance.
☞ By modifying the operating system, the software may also create weaknesses that could be exploited by malware attackers.
☞ Most importantly, a false sense of security is dangerous.
8. An AV product from the App Store, such as "ClamXav," has the same drawback as the commercial suites of being always out of date, but it does not inject low-level code into the operating system. That doesn't mean it's entirely harmless. It may report email messages that have "phishing" links in the body, or Windows malware in attachments, as infected files, and offer to delete or move them. Doing so will corrupt the Mail database. The messages should be deleted from within the Mail application.
An AV app is not needed, and cannot be relied upon, for protection against OS X malware. It's useful, if at all, only for detecting Windows malware, and even for that use it's not really effective, because new Windows malware is emerging much faster than OS X malware.
Windows malware can't harm you directly (unless, of course, you use Windows.) Just don't pass it on to anyone else. A malicious attachment in email is usually easy to recognize by the name alone. An actual example:
London Terror Moovie.avi [124 spaces] Checked By Norton Antivirus.exe
You don't need software to tell you that's a Windows trojan. Software may be able to tell you which trojan it is, but who cares? In practice, there's no reason to use recognition software unless an organizational policy requires it. Windows malware is so widespread that you should assume it's in every email attachment until proven otherwise. Nevertheless, ClamXav or a similar product from the App Store may serve a purpose if it satisfies an ill-informed network administrator who says you must run some kind of AV application. It's free and it won't handicap the system.
The ClamXav developer won't try to "upsell" you to a paid version of the product. Other developers may do that. Don't be upsold. For one thing, you should not pay to protect Windows users from the consequences of their choice of computing platform. For another, a paid upgrade from a free app will probably have all the disadvantages mentioned in section 7.
9. It seems to be a common belief that the built-in Application Firewall acts as a barrier to infection, or prevents malware from functioning. It does neither. It blocks inbound connections to certain network services you're running, such as file sharing. It's disabled by default and you should leave it that way if you're behind a router on a private home or office network. Activate it only when you're on an untrusted network, for instance a public Wi-Fi hotspot, where you don't want to provide services. Disable any services you don't use in the Sharing preference pane. All are disabled by default.
10. As a Mac user, you don't have to live in fear that your computer may be infected every time you install software, read email, or visit a web page. But neither can you assume that you will always be safe from exploitation, no matter what you do. Navigating the Internet is like walking the streets of a big city. It can be as safe or as dangerous as you choose to make it. The greatest harm done by security software is precisely its selling point: it makes people feel safe. They may then feel safe enough to take risks from which the software doesn't protect them. Nothing can lessen the need for safe computing practices.

Sony tablet sgpt111us/s trouble shooting

my sony tablet whenever I go to search it says loading then after says webpage is not available or server is not responding, why?
I have to do switch off and on make it work.
sony esupport website , when I click something it says loading it comes nothing why and whats the problem .

What browser are you using stock ?
or chrome ?
Try drag the browser you having problems with to desktop then hover it over app info.
then clear cache and data this resets browser to stock and defaults.
Maybe fixes your issue.

O i need antivirus software if i am going to download office 365 onto my new imac?

Do i need antivirus software if i am going to download office 365 onto my new imac?

1. This is a comment on what you should—and should not—do to protect yourself from malicious software ("malware") that circulates on the Internet and gets onto a computer as an unintended consequence of the user's actions. It does not apply to software, such as keystroke loggers, that may be installed deliberately by an intruder who has hands-on access to the computer, or who has been able to log in to it remotely. That threat is in a different category, and there's no easy way to defend against it.
If you find this comment too long or too technical, read only sections 5, 6, and 10.
OS X now implements three layers of built-in protection specifically against malware, not counting runtime protections such as execute disable, sandboxing, system library randomization, and address space layout randomization that may also guard against other kinds of exploits.
2. All versions of OS X since 10.6.7 have been able to detect known Mac malware in downloaded files, and to block insecure web plugins. This feature is transparent to the user. Internally Apple calls it "XProtect."
The malware recognition database used by XProtect is automatically updated; however, you shouldn't rely on it, because the attackers are always at least a day ahead of the defenders.
The following caveats apply to XProtect:
It can be bypassed by some third-party networking software, such as BitTorrent clients and Java applets.
It only applies to software downloaded from the network. Software installed from a CD or other media is not checked.
As new versions of OS X are released, it's not clear whether Apple will indefinitely continue to maintain the XProtect database of older versions such as 10.6. The security of obsolete system versions may eventually be degraded. Security updates to the code of obsolete systems will stop being released at some point, and that may leave them open to other kinds of attack besides malware.
   3. Starting with OS X 10.7.5, there has been a second layer of built-in malware protection, designated "Gatekeeper" by Apple. By default, applications and Installer packages downloaded from the network will only run if they're digitally signed by a developer with a certificate issued by Apple. Software certified in this way hasn't necessarily been tested by Apple, but you can be reasonably sure that it hasn't been modified by anyone other than the developer. His identity is known to Apple, so he could be held legally responsible if he distributed malware. That may not mean much if the developer lives in a country with a weak legal system (see below.)
Gatekeeper doesn't depend on a database of known malware. It has, however, the same limitations as XProtect, and in addition the following:
It can easily be disabled or overridden by the user.
A malware attacker could get control of a code-signing certificate under false pretenses, or could simply ignore the consequences of distributing codesigned malware.
An App Store developer could find a way to bypass Apple's oversight, or the oversight could fail due to human error.
Apple has so far failed to revoke the codesigning certificates of some known abusers, thereby diluting the value of Gatekeeper and the Developer ID program. These failures don't involve App Store products, however.
   For the reasons given, App Store products, and—to a lesser extent—other applications recognized by Gatekeeper as signed, are safer than others, but they can't be considered absolutely safe. "Sandboxed" applications may prompt for access to private data, such as your contacts, or for access to the network. Think before granting that access. Sandbox security is based on user input. Never click through any request for authorization without thinking.
4. Starting with OS X 10.8.3, a third layer of protection has been added: a "Malware Removal Tool" (MRT). MRT runs automatically in the background when you update the OS. It checks for, and removes, malware that may have evaded the other protections via a Java exploit (see below.) MRT also runs when you install or update the Apple-supplied Java runtime (but not the Oracle runtime.) Like XProtect, MRT is effective against known threats, but not against unknown ones. It notifies you if it finds malware, but otherwise there's no user interface to MRT.
5. The built-in security features of OS X reduce the risk of malware attack, but they are not, and never will be, complete protection. Malware is a problem of human behavior, and a technological fix is not going to solve it. Trusting software to protect you will only make you more vulnerable.
The best defense is always going to be your own intelligence. With the possible exception of Java exploits, all known malware circulating on the Internet that affects a fully-updated installation of OS X 10.6 or later takes the form of so-called "Trojan horses," which can only have an effect if the victim is duped into running them. The threat therefore amounts to a battle of wits between you and the scam artists. If you're smarter than they think you are, you'll win. That means, in practice, that you always stay within a safe harbor of computing practices. How do you know when you're leaving the safe harbor? Below are some warning signs of danger.
Software from an untrustworthy source
Software of any kind is distributed via BitTorrent. or Usenet, or on a website that also distributes pirated music or movies.
Software with a corporate brand, such as Adobe Flash Player, doesn't come directly from the developer’s website. Do not trust an alert from any website to update Flash, your browser, or anything else.
Rogue websites such as Softonic and CNET Download distribute free applications that have been packaged in a superfluous "installer."
The software is advertised by means of spam or intrusive web ads. Any ad, on any site, that includes a direct link to a download should be ignored.
Software that is plainly illegal or does something illegal
High-priced commercial software such as Photoshop is "cracked" or "free."
An application helps you to infringe copyright, for instance by circumventing the copy protection on commercial software, or saving streamed media for reuse without permission.
Conditional or unsolicited offers from strangers
A telephone caller or a web page tells you that you have a “virus” and offers to help you remove it. (Some reputable websites did legitimately warn visitors who were infected with the "DNSChanger" malware. That exception to this rule no longer applies.)
A web site offers free content such as video or music, but to use it you must install a “codec,” “plug-in,” "player," "downloader," "extractor," or “certificate” that comes from that same site, or an unknown one.
You win a prize in a contest you never entered.
Someone on a message board such as this one is eager to help you, but only if you download an application of his choosing.
A "FREE WI-FI !!!" network advertises itself in a public place such as an airport, but is not provided by the management.
Anything online that you would expect to pay for is "free."
Unexpected events
You open what you think is a document and get an alert that it's "an application downloaded from the Internet." Click Cancel and delete the file. Even if you don't get the alert, you should still delete any file that isn't what you expected it to be.
An application does something you don't expect, such as asking for permission to access your contacts, your location, or the Internet for no obvious reason.
Software is attached to email that you didn't request, even if it comes (or seems to come) from someone you trust.
I don't say that leaving the safe harbor just once will necessarily result in disaster, but making a habit of it will weaken your defenses against malware attack. Any of the above scenarios should, at the very least, make you uncomfortable.
   6. Java on the Web (not to be confused with JavaScript, to which it's not related, despite the similarity of the names) is a weak point in the security of any system. Java is, among other things, a platform for running complex applications in a web page, on the client. That was always a bad idea, and Java's developers have proven themselves incapable of implementing it without also creating a portal for malware to enter. Past Java exploits are the closest thing there has ever been to a Windows-style virus affecting OS X. Merely loading a page with malicious Java content could be harmful.
Fortunately, client-side Java on the Web is obsolete and mostly extinct. Only a few outmoded sites still use it. Try to hasten the process of extinction by avoiding those sites, if you have a choice. Forget about playing games or other non-essential uses of Java.
Java is not included in OS X 10.7 and later. Discrete Java installers are distributed by Apple and by Oracle (the developer of Java.) Don't use either one unless you need it. Most people don't. If Java is installed, disable it—not JavaScript—in your browsers.
Regardless of version, experience has shown that Java on the Web can't be trusted. If you must use a Java applet for a task on a specific site, enable Java only for that site in Safari. Never enable Java for a public website that carries third-party advertising. Use it only on well-known, login-protected, secure websites without ads. In Safari 6 or later, you'll see a lock icon in the address bar with the abbreviation "https" when visiting a secure site.
Stay within the safe harbor, and you’ll be as safe from malware as you can practically be. The rest of this comment concerns what you should not do to protect yourself.
7. Never install any commercial "anti-virus" or "Internet security" products for the Mac, as they all do more harm than good, if they do any good at all. If you need to be able to detect Windows malware in your files, use one of the free security apps in the Mac App Store—nothing else.
Why shouldn't you use commercial "anti-virus" products?
To recognize malware, the software depends on a database of known threats, which is always at least a day out of date. Research has shown that most successful attacks are "zero-day"—that is, previously unknown. Recognition-based malware scanners do not defend against such attacks.
Their design is predicated on the nonexistent threat that malware may be injected at any time, anywhere in the file system. Malware is downloaded from the network; it doesn't materialize from nowhere.
In order to meet that nonexistent threat, the software modifies or duplicates low-level functions of the operating system, which is a waste of resources and a common cause of instability, bugs, and poor performance.
By modifying the operating system, the software itself may create weaknesses that could be exploited by malware attackers.
Most importantly, a false sense of security makes you more vulnerable.
8. An anti-malware product from the App Store, such as "ClamXav," has the same drawback as the commercial suites of being always out of date, but it does not inject code into the operating system. That doesn't mean it's entirely harmless. It may report email messages that have "phishing" links in the body, or Windows malware in attachments, as infected files, and offer to delete or move them. Doing so will corrupt the Mail database. The messages should be deleted from within the Mail application.
An anti-virus app is not needed, and cannot be relied upon, for protection against OS X malware. It's useful only for detecting Windows malware, and even for that use it's not really effective, because new Windows malware is emerging much faster than OS X malware. Windows malware can't harm you directly (unless, of course, you use Windows.) Just don't pass it on to anyone else.
A Windows malware attachment in email is usually easy to recognize by the file name alone. An actual example:
London Terror Moovie.avi [124 spaces] Checked By Norton Antivirus.exe
You don't need software to know that's a Windows trojan. Software may be able to tell you which trojan it is, but who cares? In practice, there's seldom a reason to use recognition software unless an institutional policy requires it. Windows malware is so widespread that you should assume it's in every unknown email attachment until proven otherwise. Nevertheless, ClamXav or a similar product from the App Store may be useful if it satisfies an ill-informed network administrator who says you must run some kind of "anti-virus" application.
The ClamXav developer won't try to "upsell" you to a paid version of the product. Other developers may do that. Don't be upsold. For one thing, you should not pay to protect Windows users from the consequences of their choice of computing platform. For another, a paid upgrade from a free app will probably have all the disadvantages mentioned in section 7.
9. It seems to be a common belief that the built-in Application Firewall acts as a barrier to infection, or prevents malware from functioning. It does neither. It blocks inbound connections to certain network services you're running, such as file sharing. It's disabled by default and you should leave it that way if you're behind a router on a private home or office network. Activate it only when you're on an untrusted network, for instance a public Wi-Fi hotspot, where you don't want to provide services. Disable any services you don't use in the Sharing preference pane. All are disabled by default.
10. As a Mac user you don't have to live in fear that your computer may be infected every time you install software, read email, or visit a web page. But neither should you assume that you will always be safe from exploitation, no matter what you do. The greatest harm done by security software is precisely its selling point: it makes people feel safe. They may then feel safe enough to take risks from which the software doesn't protect them. Nothing can lessen the need for safe computing practices.

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